Some siderurgical companies sited in Mendoza, Argentina, showed interest in adequate wood provision as much in quality as in quantity in order to be used in their industries. For that reason, in the Forest Institute of the Faculty of Agrarian Sciences (UNCuyo), Eucalyptus sp. plants of species and origins arising from Australian and local seeds were produced. Plants obtained from germination were taken to field in order to evaluate their behavior under irrigation. The test was made in Nueva California, location of San Martín (Mendoza), at 653 m where soil is sandy, deep, loose, permeable and with little capacity of water retention. The irrigation was provided by sprinklers leaving a 70 mm water depth every 10 days in summer and every 20 days in winter. The species and origins tested were: E. camaldulensis origins 15022, 15028, 15195, 15799 and local; E. badjensis origin 17127; E. intertexta origins 15095 and 15886; E. grandis origin 12081; E. fastigata origin 17126; E. johnstonii origin 15352; E. astringens origin 12842; E. amygdalina origin 12831; E. andrewsii ssp andrewsii origin 13037; E. regnans origin 12034; E. tereticornis origins 13301, 13304, 13309 and local; E. benthami origin 17347; E. sargentii sargentii origin 12406; E. viminalis origin 12884; E. globulus ssp. bicostata; E. sideroxylon of local origin; E. dalrympleana origin 13348 and 15273; E. cinerea origin 25 de Mayo (Buenos Aires) and E. leucoxylon of local origin. Plant behavior at the first year was evaluated and it was expressed in the number of failures of each 100 plants, being the most promissory species in this aspect: E. camaldulensis origin 15022, E. camaldulensis origin 15799, E. camaldulensis origin 15195, E. tereticornis origin 13309 and E. camaldulensis of local origin, with less of 30 % of failures. In addition, it was taken annually forestry data from diameter at breast height (DBH) and total height of each plant. The most prominent species at fourth year were: E. camaldulensis origin 15022, 15195 and local origin; all of them with diameter between 9 and 12 cm and height between 7 and 9 m.

Aiming to study different poplar clones behaviour in the Andinean Valley of Barreal, placed in the province of San Juan, Argentina, in 1995 was set a trial with the following clones: 7 Populus x canadensis: Cima, Fogolino, Giorgione, Schiavone, Conti 12, I-214, Veronese, and 7 Populus x deltoides: Harvard, Fierolo, I-72, 67/67, 71/67, Catfish 2 and Catfish 5. The site is placed at 31°36'55&quot; S and 69°27'30&quot; W and a height of 1.628 mosl. Soil is of alluvium sediment; medium texture with middle size rolling stones, beginning at 70 cm below the surface. Plantation order was settled at 5 x 2.5 m and irrigation by surface furrows. Periodically dasometric data was taken of brest height diameter (BDH) of all individuals and total height of trees which of the average diameter on each clon. It was also observed the health development of each plant mainly to establish the presence or absence of pests and diseases like Poplar Borer and Septoria Canker. Results up to date show that higher wood production expressed in m3/ha are: Schiavone, I-214, Veronese, Conti 12 and Giorgione.

The Forestry Institute from Faculty of Agronomic Sciences depending on the Universidad Nacional de Cuyo (República Argentina) has introduced Poplar Clones from a different origens to evaluate their behaviours against of Biotic and Abiotic agents, to widen the known genetic base as well as to improve the volumetric average produced by the commercial plantations in the area. Following this line of research, in 1996 a trial was installed in an agro-forestry development placed in Departament of San Carlos, Province of Mendoza at 33°46' S, 69°02' W, and at 940 mosl. Ten Poplar Clones were evaluated: 4 P. x deltoides (Stoneville 124, EEA Delta 107/68, INTA 69/69, Fierolo) and 6 P. x canadensis (El Campeador, Neva, Luisa Avanzo, B. L. Constanzo, I-42, I-455) which were placed in plots of 9 plants each, at random with 4 replicates. Distance of plantation was 4 x 6 m. There were made yearly measurements of diameter al breast height (DBH), and total height of trees, also there were made periodical registers of sanitary situation particulary referred to the precense of cancrosis attacks. The mayor volume in wood production per hectarea was given by Stoneville 124; 322 m3/ha, EEA Delta 107/68: 293 m3/ha, INTA 69/69: 285 m3/ha and Fierolo: 239 m3/ha. The Luisa Avanzo clon showed a great susceptibility to cancrosis, which provoked a highly percentage of loss of trees during the first three year, fact which was repeated by the rest of the euramerican clones in a lower scale. Conclusion: the best behaviour under trial conditions was given by : Stoneville 124, EEA Delta 107/68 and INTA 69/69.

Mendoza is situated at the centerwestern of Argentina. It have 150 830 km2.Every agricultural and forestry activities areconcentrated in the irrigated lands which ones are only the 3 % of the territory.At the western of the province, in the limit with Chile, it is the mountain range which is part of the phytogeographical region of the Andean Desert. It has an approximated extension of 500 km, with an average width of 100 km.This work was done in order to insert coniferous and valuate their behavior of in this phytogeographical region for forestal exploitation, soil protection against water and/or wind erosion, landscape modification and tourist exploitation. The species selected in this first stage were: Cedrus deodara, Cupressus arizonica, Cupressus macrocarpa, Juniperus virginiana,Pinus griffithii, Pinus halepensis, Pinus nigra,Pinus pinaster, Pinus pinea y Pinus radiata.The experience was carrying on two sites separate by 150 km and situated at 1 050 and 2 000 meters over sea level, respectively. It was taken survival, height and diameter data, observations about growth habits and plant health conditions.Main conclusions: 1. Every species showed a good health state without important pests or diseases. 2. Growth habit was normal for each specie. It was detected double stem in Pinuspinea only. 3. The species which showed better aptitude are: Juniperus virginiana, Cupressus arizonica, Pinus pinea, Pinus pinaster and Cupressus macrocarpa.